i'm unable to use Windows Hello Face

Hello,

See if this fix helps you:

https://www.kapilarya.com/fix-facial-recognition-not-working-in-windows-11-10

Let us know if this helps!

Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.

In case there is an urgent issue, it is better contact Microsoft Support:
https://support.microsoft.com/en-us/contactus
Since when this problem started?
Are you seeing any error message?
Are you able to login with password?